Management method for underground water resources and foundation pit dewatering and drainage in engineering construction

Abstract

The invention discloses a management method for underground water resources and foundation pit dewatering and drainage in engineering construction. The management method comprises the five aspects of early-stage investigation and analysis, centralized collection, foundation pit dewatering treatment, rainwater back-supplementing and dynamic adjustment and monitoring and optimization. An adaptive scheme is formulated in the earlier stage of a project through detection of a professional instrument and combination of a mathematical model; centralized collection of water resources and foundation pit dewatering treatment are achieved in construction; the drainage and collection work of foundation pit dewatering is arranged as a whole according to the engineering construction progress, and the water resources are dynamically allocated and collected through a specially-built reservoir to meet the scene requirements of a concrete mixing plant, backfill water adding, environmental protection and dust suppression, greening irrigation and the like. And the management is continuously optimized through real-time monitoring. According to the method, scientific planning and efficient utilization of foundation pit dewatering and drainage water resources are achieved, diversified water demands of engineering construction are accurately matched, resource waste and environment damage are effectively avoided, the construction water cost is remarkably reduced, safe engineering promotion is guaranteed, and economic and environmental benefits are both achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water resource management, and particularly relates to a management method for groundwater resources and pit dewatering in engineering construction. BACKGROUND

[0002] Under the background of rapid social and economic development and accelerating urbanization, efficient utilization and scientific management of water resources have become an important link in engineering construction. As an important part of water resources, groundwater resources have the characteristics of strong stability and high water supply quality, and play a key role in water supply in engineering construction. However, the traditional groundwater exploitation and utilization mode has many drawbacks. Unreasonable exploitation will lead to serious problems such as groundwater resource depletion, water pollution and ecological system destruction, which not only affects the sustainable progress of engineering construction, but also causes irreversible damage to the surrounding environment.

[0003] In addition, in engineering construction, the water resources generated by pit excavation and drainage are often directly discharged, causing a lot of waste of water resources. At the same time, the allocation of construction water lacks scientific planning, and it is difficult to accurately meet the diversified water demand such as high requirements for water quality and water quantity stability of concrete mixing station, accurate control of water quantity according to soil moisture for backfilling, dynamic adjustment of water quantity according to weather and environment for environmental dust suppression and greening irrigation, etc., resulting in low utilization efficiency of water resources and increasing project construction cost.

[0004] Therefore, in view of the above technical problems, it is urgent to design a technical scheme which can realize scientific management and efficient utilization of groundwater resources and pit dewatering. SUMMARY

[0005] The purpose of the present application is to provide a management method for groundwater resources and pit dewatering in engineering construction, which realizes the centralized collection and reasonable allocation of groundwater resources through scientific planning and advanced technology, guarantees the sustainable utilization of water resources, and scientifically dynamically controls the pit excavation and drainage of each unit project and the actual situation of construction water in engineering construction, so as to save resources and reduce project construction investment.

[0006] In order to achieve the above purpose, the present application provides a management method for groundwater resources and pit dewatering in engineering construction, comprising the following steps:

[0007] S1: preliminary survey and scheme development: in the early stage of engineering construction, multi-source data are obtained by special instrument detection to provide accurate basic data information for subsequent groundwater resource and pit dewatering management; through the groundwater environment comprehensive evaluation model and the engineering construction influence prediction model, the groundwater resource and pit dewatering treatment scheme is developed in combination with the surrounding environment;

[0008] S2: Construction of groundwater resource centralized collection system: In the engineering construction area, according to the engineering construction plan and the foundation pit excavation plan, a groundwater collection network is constructed, distributed collection points are set, and hierarchical extraction technology is used for collection; and by using well group coordination technology, a groundwater flow model and a well group coordination optimization model are established to optimize the extraction flow, so as to realize the reasonable extraction of groundwater resources;

[0009] S3: Foundation pit dewatering treatment: In order to ensure the dry environment of the foundation pit and ensure the safe and orderly construction of the foundation pit, according to the underground water level and construction progress in the early stage of survey, a pumping well quantity calculation model and a pumping well position optimization model are established to determine the number and distribution position of pumping wells; the underground water level is lowered by pumping through the pumping wells, so that the underground water is maintained within a safe range, and combined with the geological exploration data, collection wells are selected and arranged at appropriate positions to avoid excessive collection and damage to the underground water environment;

[0010] S4: Rainwater recharge and dynamic adjustment: The Internet of Things technology is introduced to monitor the underground water level, water consumption and regional water demand in real time; through information analysis of the water demand of the mixing station, underground water extraction data and water storage data of the water storage tank, the water supply priority is automatically adjusted to realize the dynamic adjustment and recharge of rainwater to underground water;

[0011] S5: Continuous monitoring and optimization: The water level, water quality and water quantity of the underground water and the water storage tank are monitored in real time, a data sharing and visualization analysis platform is established, the system operation effect is evaluated regularly combined with the water plan of engineering construction, and the resource allocation is optimized.

[0012] Further, the groundwater flow model in step S2 is:

[0013] Wherein, Q i is the pumping flow of the i-th pumping well; K i is the permeability coefficient of the region where the i-th pumping well is located, which is determined by geological exploration data; A i is the cross-sectional area; H i is the initial water level; h i is the water level after pumping; L i is the water flow path length; the pumping flow Q i is calculated in real time by monitoring the water level data of each pumping well.

[0014] Further, the well group coordination optimization model in step S2 takes the uniformity of water level drawdown in the region after extraction of the entire well group as the optimization objective, and establishes a target function F;

[0015]

[0016] Wherein, n is the total number of pumping wells, s i , s jWater level drawdown of the i-th and j-th monitoring point around the pumping well respectively; ω ij is the weight coefficient, which is determined according to the distance between pumping wells and geological conditions; the objective function is solved by genetic algorithm or particle swarm algorithm to obtain the optimal pumping flow Q i-opt of each pumping well, so as to realize the optimization of coordinated pumping of well groups.

[0017] Further, the pumping well number calculation model in step S3 determines the number of pumping wells N according to the foundation pit water inflow Q total and the maximum allowable pumping amount of a single well Q max ; specifically,

[0018] Wherein, the foundation pit water inflow is calculated by the large well method:

[0019]

[0020] In the formula, K is the permeability coefficient of the aquifer; M is the thickness of the aquifer; H is the initial water level; h is the design drawdown depth; R is the influence radius; r0 is the radius of the large well, which is related to the shape and size of the foundation pit.

[0021] Further, the pumping well position optimization model in step S3 establishes a position optimization model with the uniformity of water level drawdown in the foundation pit and construction convenience as the target;

[0022] Let the coordinates of the pumping well be (x i ,y i ), and the water level drawdown s p of a point P=(x p ,y p ) in the foundation pit can be calculated according to the superposition principle:

[0023]

[0024] Wherein, T=K·M is the water conductivity; W(u i ) is the well function, r i is the distance from point P to the i-th pumping well, and t is the pumping time; the coordinates (x i ,y i ) of the pumping well are optimized by the simulated annealing algorithm to minimize the difference in water level drawdown in the foundation pit.

[0025] Further, in step S4, a rainwater recharge decision function U based on multi-parameter coupling is constructed to comprehensively quantitatively analyze the groundwater level H, water demand D and rainfall R, and realize scientific decision of rainwater recharge strategy; the specific decision logic is as follows:

[0026]

[0027] In the formula, Hmin and H max respectively defined as lower and upper threshold values of groundwater level safety, R th is a rainfall recharge triggering threshold.

[0028] Advantages of the present application:

[0029] 1. The present application follows the principles of sustainable development and ecological priority, through the collection of groundwater resources and the management of foundation pit dewatering, based on model optimization and well group coordination technology, while meeting the progress of engineering construction, the foundation pit dewatering resources are recycled and utilized, the protection of its recharge and regeneration capacity is focused on, the overexploitation is avoided, the ecological balance of groundwater resources is maintained, and the sustainable utilization of water resources is ensured; at the same time, the water resources of foundation pit dewatering and rainwater recharge are fully utilized in concrete mixing station, backfilling water, environmental dust suppression, greening irrigation and other links, which significantly improves the water resource utilization efficiency.

[0030] 2. The present application constructs a scientific and efficient water resource centralized collection and distribution system, collects the water resources generated by foundation pit dewatering, and leads to each construction water point, realizes resource sharing and optimal allocation, reduces water resource waste, and significantly improves water resource utilization efficiency.

[0031] 3. The present application determines the number and position of pumping wells by using models and formulas, effectively reduces the groundwater level, ensures the dry environment of foundation pit, provides safety guarantee for foundation pit construction, and ensures the safety and smooth progress of project construction.

[0032] 4. The present application combines advanced technologies such as Internet of Things and big data with fine management means, realizes real-time monitoring, dynamic adjustment and visual analysis of groundwater resources, improves the automation and intelligent level of water resource management, improves the management efficiency, and provides scientific basis for decision-making.

[0033] 5. By saving water resources and optimizing resource allocation, the dependence on external water resources is reduced, the construction water cost is reduced, thereby reducing the project construction investment and improving the economic benefit of the project. DETAILED DESCRIPTION

[0034] The present application discloses a management method for groundwater resources and foundation pit dewatering in engineering construction.

[0035] A management method for groundwater resources and foundation pit dewatering in engineering construction, comprising the following steps:

[0036] S1: preliminary survey and scheme development: in the early stage of engineering construction, obtain multi-source data through special instrument detection to provide accurate basic data information for subsequent groundwater resources and foundation pit dewatering management; through the groundwater environment comprehensive evaluation model and the engineering construction influence prediction model, combined with the surrounding environment, develop the groundwater resources and foundation pit dewatering management treatment scheme.

[0037] Among them, the groundwater environment comprehensive evaluation model builds a groundwater environment evaluation index system, including water level stability index I ws , water quality health index I wq , water flow power index I wd , etc., determines the weight w i of each index by using the analytic hierarchy process (AHP), and establishes a comprehensive evaluation function E.

[0038]

[0039] In the formula, n is the number of evaluation indexes, I i is the actual measured value or calculated value of each index.

[0040] For example, the water level stability index I ws can be calculated according to the fluctuation amplitude of groundwater level in a period of time:

[0041]

[0042] In the formula, max(Δh) is the maximum water level fluctuation value in the monitoring period, is the average water level.

[0043] Through this model, the groundwater environment is quantitatively evaluated to provide a scientific basis for the development of treatment schemes.

[0044] The engineering construction influence prediction model uses the finite element method to establish a groundwater-engineering interaction model, and systematically considers the influence mechanism of engineering construction activities such as foundation pit excavation, building load, etc. on groundwater.

[0045] The additional stress caused by engineering construction is introduced as σ, and based on the coupling equation of Darcy's law and stress-strain relationship, a quantitative calculation model of groundwater level dynamic change is established;

[0046]

[0047] In the formula, K ij is the anisotropic permeability coefficient tensor; Q represents the source and sink term; S S is the water storage rate; t is the time variable. Through this model, multi-condition simulation analysis is carried out, and combined with the surrounding environment, the specific groundwater resource treatment scheme is developed for the water demand of the mixing station, backfill construction, environmental dust suppression and greening irrigation in the project.

[0048] S2: Groundwater resource centralized collection system construction: In the engineering construction area, according to the engineering construction plan and the foundation pit excavation plan, the groundwater collection network is constructed; the distributed collection points are set, the specific collection points are determined by the site main plant, boiler room, chimney, intercooling tower, underground buried pipe and other civil foundation pit layout positions, the collection time is arranged according to the engineering progress plan; the hierarchical extraction technology is used, according to the water quality characteristics of different groundwater layers, the domestic water, industrial water and fire water are classified and collected; and the well group coordination technology is used, the groundwater flow model and the well group coordination optimization model are established, the extraction flow is optimized, and the reasonable extraction of groundwater resources is realized.

[0049] The groundwater flow model is:

[0050] In the formula, Q i is the pumping flow of the i-th pumping well; K i is the permeability coefficient of the region where the i-th pumping well is located, which is determined by geological exploration data; A i is the water section area; H i is the initial water level; h i is the water level after pumping; L i is the water flow path length; by monitoring the water level data of each pumping well, the pumping flow Q i is calculated in real time.

[0051] The well group coordination optimization model takes the uniformity of water level drawdown in the region after the entire well group extraction as the optimization objective, and establishes the objective function F;

[0052]

[0053] In the formula, n is the total number of pumping wells, s i , s j are the water level drawdowns of the i-th and j-th pumping wells, respectively; ω ij is the weight coefficient, which is determined according to the distance between the pumping wells and the geological conditions; the objective function is solved by genetic algorithm or particle swarm algorithm to obtain the optimal extraction flow Q i-opt of each pumping well, realizing the well group coordination extraction optimization.

[0054] S3: Foundation pit dewatering treatment: In order to ensure the dry environment of the foundation pit and ensure the safe and orderly construction of the foundation pit, according to the underground water level and the construction progress in the early stage, the pumping well number calculation model and the pumping well position optimization model are established to determine the number and distribution position of the pumping wells; the groundwater level is lowered by pumping through the pumping wells, so that the groundwater is maintained within a safe range, and combined with the geological exploration data, the collection wells are arranged at appropriate positions to avoid excessive collection and damage to the underground water environment.

[0055] The number of pumping wells is calculated according to the foundation pit water inflow Q total and the maximum allowable water pumping amount of a single well Q max to determine the number of pumping wells N; specifically

[0056] wherein the foundation pit water inflow is calculated by the large well method:

[0057]

[0058] wherein K is the aquifer permeability coefficient; M is the aquifer thickness; H is the initial water level; h is the design dewatering depth; R is the influence radius; and r0 is the large well radius, which is related to the shape and size of the foundation pit.

[0059] The pumping well position optimization model takes the uniformity of water level drawdown in the foundation pit and the construction convenience as the target to establish a position optimization model.

[0060] Let the pumping well coordinates be (x i ,y i ), and the water level drawdown s p of a point P = (x p ,y p ) in the foundation pit can be calculated according to the superposition principle:

[0061]

[0062] wherein T = K·M is the water conductivity; W(u i ) is the well function, r i is the distance from point P to the i-th pumping well, and t is the pumping time; the pumping well coordinates (x i ,y i ) are optimized by the simulated annealing algorithm to determine the pumping well distribution position, so as to minimize the difference in water level drawdown in the foundation pit.

[0063] By pumping water to lower the groundwater level, combined with geological exploration data, the collection well is arranged at a suitable position to avoid excessive collection and ensure the dry environment of the foundation pit, so as to ensure the safe and orderly construction of the foundation pit, while effectively recycling the water resources generated by dewatering for other water use scenarios of the project construction.

[0064] S4: Rainwater recharge and dynamic adjustment: introduce Internet of Things technology to monitor the groundwater level, water usage and regional water demand in real time; through information analysis of the water demand of the mixing station, groundwater pumping data and water storage data of the storage tank, automatically adjust the water supply priority to realize the dynamic adjustment and recharge of rainwater to groundwater.

[0065] Specifically, a rainwater recharge decision function U based on multi-parameter coupling is constructed to comprehensively quantitatively analyze the groundwater level H, water demand D and rainfall R, and realize scientific decision of the rainwater recharge strategy. The specific decision logic is as follows:

[0066]

[0067] In the formula, H min and H max are respectively defined as the lower limit threshold and the upper limit threshold of the groundwater level safety, R th is the rainfall recharge triggering threshold; the dynamic recharge of rainwater to groundwater is realized, and system joint debugging and parameter optimization are carried out.

[0068] According to different water scene requirements, such as stable water supply for the concrete mixing station, real-time adjustment of water quantity according to soil detection data for the backfilling soil water adding, dynamic distribution of water quantity combined with weather conditions for the environmental protection dust suppression and greening irrigation, and accurate regulation and control of water resource supply.

[0069] S5: continuous monitoring and optimization: the water level, water quality and water quantity of the groundwater and the water storage tank are monitored in real time, a data sharing and visual analysis platform is established, the system operation effect is evaluated regularly combined with the water plan of the engineering construction, and the resource allocation is optimized; the requirements of the concrete mixing station, the backfilling soil water adding, the environmental protection dust suppression, the greening irrigation and other water links are ensured, and the scientificity and effectiveness of the groundwater resource management are improved.

[0070] With the above ideal embodiments according to the present application as inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the contents in the specification, and must be determined according to the scope of claims.

Claims

1. A management method for groundwater resources and foundation pit dewatering during engineering construction, characterized in that: Includes the following steps: S1: Preliminary Investigation and Solution Development: In the early stages of project construction, multi-source data is obtained through specialized instruments to provide accurate basic data information for subsequent groundwater resource and foundation pit dewatering management; groundwater resource and foundation pit dewatering treatment solutions are developed by combining the groundwater environment comprehensive assessment model and the project construction impact prediction model with the surrounding environment. S2: Construction of a centralized groundwater collection system: Within the project construction area, based on the project construction plan and the foundation pit excavation plan, a groundwater collection network will be constructed, distributed collection points will be set up, and stratified extraction technology will be used for collection; Furthermore, by employing well cluster collaboration technology, and by establishing a groundwater flow model and a well cluster collaboration optimization model, the extraction flow rate is optimized to achieve rational extraction of groundwater resources. S3: Dewatering Treatment of Foundation Pit: To ensure a dry environment in the foundation pit and to ensure the safe and orderly progress of foundation pit construction, a calculation model for the number of pumping wells and an optimization model for the location of pumping wells are established based on the groundwater level surveyed in the early stage and the construction progress. The number and distribution of pumping wells are determined. Water is pumped out through the pumping wells to lower the groundwater level and keep the groundwater within a safe range. In conjunction with geological exploration data, appropriate locations are selected for the placement of collection wells to avoid excessive collection that could damage the groundwater environment. S4: Rainwater Replenishment and Dynamic Regulation: Introducing IoT technology to monitor groundwater level, usage flow and regional water demand in real time; through information analysis of water demand for concrete mixing plants, groundwater extraction data and water storage data in reservoirs, automatically adjusting water supply priority to achieve dynamic regulation and replenishment of groundwater by rainwater; S5: Continuous monitoring and optimization: Real-time monitoring of groundwater and reservoir water level, water quality and water quantity; establishment of a data sharing and visualization analysis platform; regular evaluation of system operation performance in conjunction with engineering construction water use plans; and optimization of resource allocation.

2. The management method for groundwater resources and foundation pit dewatering in engineering construction according to claim 1, characterized in that: The groundwater flow model in step S2 is as follows: Among them, Q i K represents the pumping flow rate of the i-th pumping well. i A is the permeability coefficient of the area where the i-th pumping well is located, determined by geological exploration data; i H is the cross-sectional area of ​​the water passage; i The initial water level; h i This is the water level after pumping; L i The length of the water flow path; the pumping flow rate Q is calculated in real time by monitoring the water level data of each pumping well. i .

3. The management method for groundwater resources and foundation pit dewatering in engineering construction according to claim 1, characterized in that: The well group collaborative optimization model in step S2 takes the uniform drawdown of the water level in the area after the entire well group is extracted as the optimization objective and establishes an objective function F. Where n is the total number of pumping wells, s i s j ω represents the drawdown at monitoring points surrounding the i-th and j-th pumping wells, respectively; ij The weighting coefficients are determined based on the distance between pumping wells and geological conditions. The objective function is solved using a genetic algorithm or particle swarm optimization algorithm to obtain the optimal pumping flow rate Q for each pumping well. i-opt This enables optimized collaborative pumping across a group of wells.

4. The management method for groundwater resources and foundation pit dewatering in engineering construction according to claim 1, characterized in that: The calculation model for the number of pumping wells in step S3 is based on the water inflow rate Q of the foundation pit. total And the maximum allowable pumping capacity Q of a single well max Determine the number of pumping wells N; specifically: The water inflow volume in the foundation pit was calculated using the large well method. In the formula, K is the aquifer permeability coefficient; M is the aquifer thickness; H is the initial water level; h is the design drawdown depth; R is the radius of influence; and r0 is the radius of the large well, which is related to the shape and size of the foundation pit.

5. The management method for groundwater resources and foundation pit dewatering in engineering construction according to claim 1, characterized in that: The pumping well location optimization model in step S3 aims to optimize the uniformity of water level drawdown and construction convenience within the foundation pit. Let the coordinates of the pumping well be (x i ,y i ), a point P = (x) inside the foundation pit p ,y p ) water level drawdown s p It can be calculated based on the superposition principle: Where T = K·M, is the hydraulic conductivity; W(u i ) is the well function. r i Let x be the distance from point P to the i-th pumping well, and t be the pumping time; optimize the pumping well coordinates (x, t) using simulated annealing algorithm. i ,y i This minimizes the difference in water level drawdown within the foundation pit.

6. The management method for groundwater resources and foundation pit dewatering in engineering construction according to claim 1, characterized in that: In step S4, a rainwater recharge decision function U based on multi-parameter coupling is constructed. This function comprehensively and quantitatively analyzes groundwater level H, water demand D, and rainfall R to achieve a scientific decision on rainwater recharge strategies. The specific decision logic is as follows: In the formula, H min and H max R is defined as the lower and upper limits of the groundwater level safety threshold, respectively. th The threshold for triggering rainfall replenishment.

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